Interesting. It might be a translation error then. What language are you working with? In English, the description seems clear to me. In what language are you seeing the lack of clarity?
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I will agree with you, that it is disappointing in some ways that the actual game options aren't continually being worked on by the original developers. I believe the last time that they made modifications to any of the actual game options that civ4 began with was 2009. On the other hand, if they were still working on civ4, we would be less likely to have C2C, so there's that. On the other, other hand, we would also be less likely to have civ5...